| /** |
| * $RCSfile$ |
| * $Revision$ |
| * $Date$ |
| * |
| * Copyright 2003-2007 Jive Software. |
| * |
| * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.jivesoftware.smack.util; |
| |
| import java.io.*; |
| import java.util.*; |
| |
| /** |
| * An ObservableWriter is a wrapper on a Writer that notifies to its listeners when |
| * writing to character streams. |
| * |
| * @author Gaston Dombiak |
| */ |
| public class ObservableWriter extends Writer { |
| |
| Writer wrappedWriter = null; |
| List<WriterListener> listeners = new ArrayList<WriterListener>(); |
| |
| public ObservableWriter(Writer wrappedWriter) { |
| this.wrappedWriter = wrappedWriter; |
| } |
| |
| public void write(char cbuf[], int off, int len) throws IOException { |
| wrappedWriter.write(cbuf, off, len); |
| String str = new String(cbuf, off, len); |
| notifyListeners(str); |
| } |
| |
| public void flush() throws IOException { |
| wrappedWriter.flush(); |
| } |
| |
| public void close() throws IOException { |
| wrappedWriter.close(); |
| } |
| |
| public void write(int c) throws IOException { |
| wrappedWriter.write(c); |
| } |
| |
| public void write(char cbuf[]) throws IOException { |
| wrappedWriter.write(cbuf); |
| String str = new String(cbuf); |
| notifyListeners(str); |
| } |
| |
| public void write(String str) throws IOException { |
| wrappedWriter.write(str); |
| notifyListeners(str); |
| } |
| |
| public void write(String str, int off, int len) throws IOException { |
| wrappedWriter.write(str, off, len); |
| str = str.substring(off, off + len); |
| notifyListeners(str); |
| } |
| |
| /** |
| * Notify that a new string has been written. |
| * |
| * @param str the written String to notify |
| */ |
| private void notifyListeners(String str) { |
| WriterListener[] writerListeners = null; |
| synchronized (listeners) { |
| writerListeners = new WriterListener[listeners.size()]; |
| listeners.toArray(writerListeners); |
| } |
| for (int i = 0; i < writerListeners.length; i++) { |
| writerListeners[i].write(str); |
| } |
| } |
| |
| /** |
| * Adds a writer listener to this writer that will be notified when |
| * new strings are sent. |
| * |
| * @param writerListener a writer listener. |
| */ |
| public void addWriterListener(WriterListener writerListener) { |
| if (writerListener == null) { |
| return; |
| } |
| synchronized (listeners) { |
| if (!listeners.contains(writerListener)) { |
| listeners.add(writerListener); |
| } |
| } |
| } |
| |
| /** |
| * Removes a writer listener from this writer. |
| * |
| * @param writerListener a writer listener. |
| */ |
| public void removeWriterListener(WriterListener writerListener) { |
| synchronized (listeners) { |
| listeners.remove(writerListener); |
| } |
| } |
| |
| } |